Numerical analysis of different pulse propagation on nonuniform transmission lines

The paper approaches the topic of the numerical modelling of the electromagnetic disturbances that occurs on HV lines. Being broadband signals, an accurate evaluation of the disturbances propagation on HV lines requires that the transmission lines model be taken into consideration. Therefore, in the first part of the paper the principles of modelling using non-uniform transmission lines are emphasized. Then the per-unit-length parameters computation is detailed, with the terms which take account of the influence of a lossy ground. In the second part of the paper the implemented numerical computation algorithm is presented. In the last part of the paper there are presented several examples using a concrete HV line to which several standard test signals have been applied.